Attachment for moving-picture projectors



ATTACHMENT FOR MOVING PICTURE FROJECTORS Filed April 11. 1927 2 Sheets-Sheet 1 l N V E N TO R 650 665 MAI/ Q ATTORNEYS Feb. 7, 1928.

1,658,454 G. MAYER ATTACHMENT FOR MOVING PICTURE PROJECTORS Filed April 11, 1927. 2 Sheets-Sheet 2 III """ulummmiT...

lNVEN TOR $50 665 fi/H/Ee Allis GEOEGE MAYER, OF BRONX, NEW YORK.

ATTACHMENT FOR llIOVING-PZGTURE PROJECTORS.

Application riled April 11,

This invention relates to moving picture projectors and has for its principal object to provide a new and improved attachment adapted to be secured to a well known type of hand operated projector for converting it into a power driven machine.

The above and oth r objects of my invention will appear more fully from the following more detailed description and by reference to the accompanying drawings forming a part hereof and wherein Fig. 1 is a front elevation of a projecting machine showing my attachment secured thereto; Fig. 2 is a side elevation of the structure shown in FE g. 1 and Fig. 8 is a detail perspective view of the attachment bracket.

In Figs. 1 and 2 of the drawings I have shown a moving picture projector 10 of the type with which my improved attachment is intended for use. Machines of this type are provided on each side thereof with a gear train, the construction and operation of which need not, for the purposes of the present application, be described in detail as such form no part of the present invention. It will be sufiicient to state that the gear train shown at the right hand side of Fig. 1 and of which the gear 11 forms a part drives the film sprockets 12, 13, while the gear train shown at the left of said figure and of which the gear it forms a part drives a fly wheel 15 and other parts of the projector. Both gear trains are driven in unison through the medium of a-transverse shaft 16 to which are secured the gear 14 above mentioned and the gear 17, the latter being in mesh with the 11 and driving the right hand gear train. Also secured to said shaft 16 is a skew gear 18 which meshes with and drives a co-operatng skew gear secured to a shutter shaft 19 which extends at a right angle to the shaft 16.

The use of an attachment for driving by power a projector of the type shown is not broadly new as such attachments have heretofore been employed. The attachments heretofore used however have been provided with gearing which meshes with and drives gear 11 of the right hand gear train. In order that the proper driving speed of the machine may be readily secured it has been the practice to so design the gears of the attachment that the belt pulley of the attachinent will perform one complete rotation for each complete rotation of the shutter shaft 19. For securing this desired speed ratio,

1927. Serial No. 182,?28.

it has been necessary with the attachments as heretofore constructed to provide them with a reduction gear train consisting of three gears. Owing to the provision of these extra gears and also due to the fact that the attachment driving pinion meshed with the gear 11, a relatively large gear which drives the small gear 17, the prior attachments have man J obj ectionable features. such as requiring the use of too much power, and causing the gear 11 to be rendered useless by wear in a comparatively short time. In addition, another objectionable feature of such attachments is that as they are clamped upon one side only of the bottom flange of the frame casting of the projector, the casting is frequently cracked or broken by the concentration of the st "ains in a relatively small part thereof.

in accordance with my invention, instead of havin the attachment bracket secured to one side only of the machine frame and having the driving pinion of the attachment in mesh with the right hand gear train, I employ a bracket raving a pair of bearing standards 18, 19, one at each side of the bracket, a pair of wings 20, 21 extending rearwardly from said standards, and a connecting web 22 joining said standards at the front bottom part thereof. At their upper ends the standards 18, 19 are provided with suitable bearings for ajack shaft 23, one end of which projects outwardly beyond the standard 19 and has secured thereto a grooved pul ey 24, about which is adapted to be trained, a belt, driven from any suitable source of power, such, for example, as by a small electric motor, (not shown). To the other end of the jack shaft 23 is secured a driving pinion 25 located inside the stand ard 18 and in mesh with the gear 14. The pinion 25 and a collar 26, also secured to said jack shaft, co-operate with the standards 18, 19, respectively, to prevent longitudinal movement of said shaft.

For securing the bracket to the machine frame, each of the wings 20, 21 is provided with a slot or aperture through which may pass the bolts 27 which serve to fasten the machine to a table or other support. The bracket is also provided at one side thereof w'th a depending lug 28, having slots 29, 'ough which the bolts or screws are By constructing the attachment as above set forth, 1 am enabled to impartthe driv- 'ing power through the medium'of a single pinlon 25 to the gear 14 and as this gear is not only of smaller diameter than the gear 11 and 18 also secured to the same shatt as the gear 17 which drives the right hand gear train, the amount'o' 1 driving pinion which meshes directly with a ,gear of the machine. Furthermore as the "gear 14 is much smaller than the gear 11,

replacement cost of the gear 14 is less.

Inladditionas'the bracket is clamped to both sides'of the machine frame breakage of the latter is not only overcome but the attachment is .more rigidly and more securely held in position. v A turther[objectionable feature of the old attachment which thepresent invention overcomes is that with the former it was very difiicult, because of the limited space between the gear 11 and the bottom flange or themachine frame, in which space the at taehment was mounted, to clean the parts thereof, while with my device ample clear ance-isiprovided between all'the gears ofthe machine and the bracketto enable the latter to ,be easily cleaned.

--Having thus described my invention, I

.daimasnew and desire tosecure by'Letters' Patent of the United States:

1- -An attachment for converting aihand operated type of motion picture projector to a power drivenmachine, comprising a power required'for V jack shaft,

bracket having a pair of upwardly extending bearing standards, wings extending latorally from the base of said standards, and

web joining said standards and holding them in spaced relationship, a jack shaft "rotatably mounted-in said bearings, and a pulley mounted on said driving pinion and a ack shaft.

2. Anattachment for converting a hand operated type of motion picture projector to power driven machine, comprising a bracket having a pair of upwardly extendvingibearingstandards, a jack shaft mounted eperatedltype of motion picture projectorto power driven machine, comprising a bracizethaving a pair of upwardly eXtendmg bearing standards, wings entendlng laterally from said standards andadapted -to strad' l'e' the frame of said projector, and to be clamped: to the base thereof, aweb'joinin said standards, and a lug "extendingdo'wnwardly from said bracket "and being provided with apertures'tl'irough which bolts are adapted to be passed and screwed'into said base, a jack shaft rotatablyinounted in said standards, a'pinion's'e'curedtosaidjack shaft and in mesh with a gear'of saidmachine, and a belt pulley mounted on "said In testimony whereof Iha've hereunto "set handj I I GEORGE MAYER. 

